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Prove that the function f(x)=tanx-4x is ...

Prove that the function `f(x)=tanx-4x` is strictly decreasing on `(-pi//3,\ pi//3)` .

A

`(-(pi)/(3), (pi)/(3))`

B

`((pi)/(3), (pi)/(2))`

C

`(-(pi)/(3), (pi)/(2))`

D

`((pi)/(2), pi)`

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A
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